package cn.edkuir.cart.interceptor;

import cn.edkuir.cart.vo.UserInfoTo;
import cn.edkuir.common.constant.AuthServerConstant;
import cn.edkuir.common.constant.CartConstant;
import cn.edkuir.common.vo.MemberRespVo;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 执行目标方法之前, 判断用户的登录状态并封装传递给controller
 */
public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();


    //目标方法执行之前拦截
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();

        HttpSession session = request.getSession();
        MemberRespVo user = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        if(user != null) {
            userInfoTo.setUserId(user.getId());
        }

        Cookie[] cookies = request.getCookies();
        if(cookies != null && cookies.length > 0) {
            for (Cookie cookie : cookies) {
                //user-key
                String name = cookie.getName();
                if(name.equals(CartConstant.TEMP_USER_COOKIE_NAME)) {
                    userInfoTo.setUserKey(cookie.getValue());
                    userInfoTo.setTempUser(true);
                }
            }
        }

        //如果没有临时用户, 则分配
        if(StringUtils.isEmpty(userInfoTo.getUserKey())) {
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }

        //目标方法执行之前
        threadLocal.set(userInfoTo);
        return true;
    }


    //业务执行之后, 如果没有则分配临时用户让浏览器保存user-key
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler
            , ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();

        if(userInfoTo.isTempUser()) {
            return;
        }

        Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
        cookie.setDomain("mall.com");
        cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
        response.addCookie(cookie);
    }
}
